(过程)1/2+x=1 x-5/7=1/2 x+2/3=10/11 x-5/12=3/8 x+3/4=5/6 x+2/3-1/2=2 计算3/4+5/12-11/24 23/28+(13/14+1/70) 9/16-1/8-3/8 1/15
(过程)1/2+x=1 x-5/7=1/2 x+2/3=10/11 x-5/12=3/8 x+3/4=5/6 x+2/3-1/2=2 计算3/4+5/12-11/24 23/28+(13/14+1/70) 9/16-1/8-3/8 1/15+2/7+14/15+5/7 1-3/7-4/7 1-(1/6-1/7)+1/6 5/8+7/9+3/8 25/15-2/5-3/5 2/3+7/10+1/3+3/10 5/9-5/12+4/9 8/9-(1/5-1/9) 5/12+11/15-5/15+7/12 5/9+1/6 5/8+1/3 1/4+2/5+3/8 11/20-2/5 5/6+1/2 1-2/7-1/2 6/7+1/6=( )-5/12=( ) 4/5+1/6=( )-5/12=( ) 3/4+1/6=( )-5/12=( ) 7/12-5/12 5/6-3/10 1/2+1/5+3/10 2/7+2/3 2/5+1/3 1-2/3-1/4
(1)1/2+x=1 (2) x-5/7=1/2
x=1-1/2 x=1/2-5/7
x=1/2x=7/14-10/14=-3/14
(3) x+2/3=10/11
x=10/11-2/3
x=33/30-20/30
x=13/30
(4)x-5/12=3/8(5)x+3/4=5/6(6) x+2/3-1/2=2
x=3/8+5/12x=5/6-3/4 x=2+1/2-2/3
x=19/24 x=10/12-9/12=1/12x=5/2-2/3=15/6-4/6=11/6
这是一部分的,待会儿补上(1)2又5/7=( )/7 1又13/16=()/16 5又7/8=3又( )/8 4=()/2 (2)把下面的数化成分母是30而大小不变的分数1/37/10 5/62/5(1)2又5/7=(19 )/7 1又13/16=( 29 )/165又7/8=3又( 23)/8 4=( 8 )/2(2)把下面的数化成分母是30而大小不变的分数1/37/10 5/62/5解,得:10/30 21/30 25/30 12/30